Move expanable trails to most popular
Add A/B for expandable most popular trails
Fix jshint errors
Fix merge conflicts
Change most popular content api call
Fix scala tests
Duplicate most popular lookup function to reduce Content
Don't extend CSS objects directly
Isolate most popular expandable content api query and akka agent
fix merge conflicts
Fix jshint errors
Merge pull request #1505 from guardian/inline-most-popular

Exapandable most popular trails